Analysis of grain refining and subsequent coarsening along on adjacent zone of friction stir welded armour grade aluminium alloy joints

Abstract

This research article presents the metallography characteristics and mechanical behavior of eco-friendly friction stir welded heavy thick rolled aluminium alloy. The travel speed and pin rotational speeds were 25 mm min−1 and 250 rpm. For this investigation tapered threaded pin profile were used for this metal joining with dimensions of (12 × 36 × 11.6) mm. Evaluated mechanical properties of tensile and microhardness values of nugget zone has been compared with parent aluminium alloy also correlated with microstructure. The metallurgical characteristic of microstructural topographies was examined optical microscopy. The fracture surface morphology has revealed of smooth and notch tensile specimen was using a secondary electron detector by SEM. The elemental analysis has been carried out in stir zone to analyze the constitutions aid of energy dispersive spectroscopy. TEM analysis has carried out qualify and quantify the strengthening precipitates of armour grade aluminium alloy joints. The SAD patterns also used to represent the polycrystalline nature of metal as well as correlate the semi- coherent and incoherent phase formations. From the results of the armour aluminium alloy joints were an appreciably lower value than the parent metal. The transverse tensile strength value of FSW joints was found to be 70% than the base aluminium alloy.